Rotary machine



Jan. 16, 1951 N. N. sTRATvElT ROTARY MACHINE n We. 7

a. rj

Filed Dec.

Patented Jan. 16, 1951 Nils Nilsen Strtveit, Oslo, Norway ApplicationDecember 30, 1947, Serial No. 794,557 In Sweden December 31, 1946 IClaims. l This'inventionrelates to rotary machines having a piston thatdoesvnot rotate about its own axis and that operates in a working spacebounded by stationary end walls. The movement of the piston may forinstance be such that all 'points on the piston move in circular orbitsof equal radii.

Such a rotary machine may be used as compresser, as pump or as motor.

The main characterising feature of the present prises a housing I havingtwo plane end walls 2 invention consists inthat the transmission ofpower between the driving shaft and the piston is effected by means oforgans rigidly secured to the piston at the ends of the latter.

In a` preferred embodiment of the invention the power transmittingorgans extend through one or more of the stationary end walls, but theinvention is not restricted to such feature.

Suitably the power transmission organs may consist of pins or studsextending in parallel to and 3 respectively,` between which are providedtwo concentric cylinder walls, 4 and 5 respectively.Y Between saidcylinder walls is coniined the; annular working chamber 6. The inlet Iand the outlet 8 of the chamber E are provided in the outer cylinderwall 5. Between said inlet and outlet extends a radial wall 9, whichseparates the high pressure side from the low pressure side.

Within the annular working chamber 6 operates the piston I0. Also thepiston is of annular Ithe driving shaft through openings in the endwalls of the working space and being, at the inner side of said walls,rigidly secured to the piston, and being'each, exterior of said walls,connected to a disc that extends at right angles to theshaft and isrotatable on ycrankV pins carried by the 'driving shaft.

Said openings in the end walls of the working chamber may suitably havecircular cross section and be sealed by rotatable, disc-shaped sealingorgans through which the power transmission organs extend. Such sealingorgans then simultaneously may serve to guide the movement of thepiston.

The invention will be more fully explained with referenceto the drawing.

In the drawing:

Figure is a sectional view of an embodiment,

the section being taken on line I-I of Fig.- 2 and Figure 2 shows asection taken on line II--II of Fig. 1. o

Figure 3 is a broken sectional View illustrating a modification ofFigure 1.

Figures 4 and 5 are sectional views of another embodiment oftheinvention, the sections being taken on line IV-IV off Fig. 5 and on lineVV of Fig. 4, respectively.

Figure 6 is a Vertical section of a detail on Fig. 4, onl a largerscale, and

Figure 7 is a Vertical section 'of a modification of said detail,whereas Figure 8 is a side view corresponding to Fig. '7.

Figure 9 is a sectional view similar to Fig. 3 but shows still anotherembodiment.

The machine shown on Figures 1 and 2 com- '2 sealed off.

shape but it is provided with an yaxial slot at the location of wall 9.This slot is necessary in order that the piston shall be able to moveunhindered by wall 9. vThe piston is hollow and the thickness thereof isrelatively great. On each end the piston is provided with four pins orstuds Il. These are rigidly secured to the piston and extend throughopenings I2 in the end walls of the working chamber. Pins II are rigidlyconnected to discs I3 or I4 respectively. Said discs rare journalled atI5 and I6 respectively on an eccentric shaft I'I mounted in the housingI by means of bearings I3 and I 9. The piston I0 does not rotate aboutits own axis, but may, for instance, have such motion that all points onthe saine are moving in circular orbits the radii of which are equal tothe eccentricity of the shaft.

Those portions of the openings I2 that are not at all times taken up bythe pins II must be In the embodiment illustrated on Figures 1 and 2this is accomplished by giving the piston a thickness somewhat largerthan the sum of extension of the pins or studs in radial direction andthe eccentricity e of the shaft I'I multiplied by 4. Thefend faces ofthe piston then 'will act as sealing `organs for the openings.

In the embodiment shown on Figure 3 the openings I2 are sealed bymeansof anges 20 secured to the piston at the ends of the same. Saidflanges are received in pockets 2l extending radially inwards from theworking chamber 6, along the end walls 2 and 3 respectively. Apparentlythe flanges might as well extend radially outwards and be received incorresponding outwardly directed pockets, or the anges might extend bothoutwards and inwards.

In the embodiment disclosed on Figures 4 and 5 the openings I2 aresealed by means of special sealing organs.

The openings I2 then suitably may be circular and the sealing organsconsist of circular discs 22, each rotatably mounted in an opening. The

pins II may extend through eccentrically ar- 3 ranged apertures 23 inthe discs. By the use of a su'icient number of pins H the circularsealing organs may at the same time serve to guide the movements of thepiston in such manner that all points on the piston move in circularorbits having radii equal to the eccentricity of the shaft.

Figures 6 and 7, 8 show, on a larger scale, details of such sealingorgans.

On Figure 6 the Iaperture 23 through which a pin Il extends has somewhatgreater diameter than the pin, in order to avoid excessive fric'- tion.The pins are supposed to be rigidly confA nected to the piston IB, sothat the pinswill rotate relatively to the sealing organs -22. :In orderto obtain' effective sealing in spite of the play between pin Il anddisc 22,1t1'i'ere'is provided v"'a sealing disc 24 abutting against theedgepo'rtin's of aperture 23 at one end thereof. Suitably VIthe sealingdisc 24 may be arranged counter-sunk in a cavityf25 milled in the disc22.

Due to the play between pin i I and disc v22 the construction justdescribed does not V.provide {ora fully effective guiding o'f themovements 'of `the piston. Figures 7 and 8 illustrate .how such guidingmay become ent-irely eiective. In v.',tl1eape1-ture '26,vthroughWhich-pin Il extends,

isplaced a sleeve 2l'. iSaid sleeve 'has an openl' t.ing 28 therethroughof extended cross section.

inder walls through said axial slot in said piston and having fluidtight contact with the outer cylinder wall between said inlet and saidoutlet, an eccentric shaft rotatably mounted in said housing, a discjournalled on said shaft externally to said housing at each end thereof,said end Walls having openings therethrough adjacent saidpiston, pinsrigidly connecting said discs and said piston extending 'throughsaid'openings in said end walls, said pins constituting means for`transmission of power to or from said piston.

2. A rotary machine as claimed in claim 1, said openings through saidend walls being elongated, said piston having a thickness greater thanthe openings in said end Walls through which the v`power :transmissionpins extend, said pins being 'soarranged with respect to said piston andsaid discs' that the piston end Walls form sealing means for saidopenings in said end walls.

r.3.A- ,rotary machine as claimed in claim 1, sealing-.'iianges onrsaidpistonat the ends thereof extending :atright angles lto the machineaxis andslidablyfco-acting with lthe openings insaid end walls.

4. A rotary machine as claimedin claim 3,

Y the inner of said concentric cylinder wallsbing The largest dimensionof the cross section is l greater than the diameter of stud lvl, whereas.the smallest dimension of the cross section is .less'than saiddiameter. The opening A28 has ltwo Aparallel opposite side faces 29 andthe pin ily] is shaped correspondingly, so that it may slide Fup anddown within the opening '28, but caniit move transversely thereto.manner as explained in connect-ion with Figure ifth'epin "H is also inFigure 7 provided with a "3`5 In the same sealing disc "24 placed in acut-out 25 in they V`dise '22.

, Aboveare described embodiments in which the 'power transmission organsextend through the `stationary end -walls of the working chamber.

Even if thisis considered the preferred 'form of fthe invention, aconstruction. asiilustrated on'Fig- .Li1re9 will alsobepossible. I-'Ierethe power transmission organs A3@ are arranged at the vinner side 4ofthetend Walls of the working'chamber and eX- -tend through the innerwall of said working :chamber: 'I`he organs"3ll, which may 'have Ydiscshape, are provided with apertures through vwhich lpass axiallyextending parts -32 connecting the .inner Wall `4 of the workingYchamber with the ,end walls 2Y and 3 thereof.

- I `I claim:

1. `A rotarymachine comprising .a housinglhaving spaced plane-end walls,two spaced concentric cylinder Walls secured between said plane endYwalls and forming therebetween 4an annular workingchamben-the outer ofsaid Vcylinder Walls ,having an inlet and an .outletfor said working.chamber therethrough, an annular shapedfpiston in `said WorkingYchamber having an axial slot therein, a radial wall extending betweensaid planeend walls and from the inner of said cyloffset adjacent theends thereof to vform pockets in said working chamber viorreceiving saidsealing flanges. v

t 5. A rotary'machine -as claimed in claim 1, lsaid openings in said.end walls being cylindrical, .circular sealing discsinsertedlin saidopenings, said circular discshaving eccentrically arranged kaperturestherethrough andfsaid pins extending' through `saidfapertures insaidcircular discs, said `circular discs.constitutingsealing organs for saidmachine, said sealingorgans together with said pins serving as guidingorgansior themovement .of thefpiston. Y

`6. `VA yrotary machine as claimed in claim l, said .pins constitutingmeansior Atransmission of power being cylindrical :and extendingparallel to Athe driving shaft and through said .openings Y-in .theendwalls `ol? the workingchamber, 'said .pins being, at -theinnel` side ofsaid walls, rigidly secured to the piston and said disc-beingrigidlythereon, .outside ofsaid walls, at each machine side, said Vdisc beingkrotatable Lon said eccentric shaft. Y Y

7. rotary machine as claimed in '-claim y6, .in which `the diameters ofVsaid 4openings .are

-greater than those -of said pinssaidpins carryy The -Vfollowing`references are '-of Vrecord "in I:the le of `this 'l'patentt UNITEDSTATES PAILN TS Number

